I did it as well. Was a good ride on the whole, with well stocked rest stops. I agree that the only problems were:

1.) the standard of some of the roads (particularly when the ride went into Wisconsin). I feared for my wheels; and

2.) the directions painted on the road were patchy in some places. We ended up doing another 10 miles because of a badly signed turn.

All in all a good ride. I would recommend it.